US4181108A - System for the control of the composition of the fuel-air mixture of an internal combustion engine - Google Patents

System for the control of the composition of the fuel-air mixture of an internal combustion engine Download PDF

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Publication number
US4181108A
US4181108A US05/875,710 US87571078A US4181108A US 4181108 A US4181108 A US 4181108A US 87571078 A US87571078 A US 87571078A US 4181108 A US4181108 A US 4181108A
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Prior art keywords
air
fuel
carburetor
cam
engine
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Expired - Lifetime
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US05/875,710
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English (en)
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Francesco Bellicardi
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Edoardo Weber SpA
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Edoardo Weber SpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • F02M3/09—Valves responsive to engine conditions, e.g. manifold vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0015—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using exhaust gas sensors
    • F02D35/0046—Controlling fuel supply
    • F02D35/0053—Controlling fuel supply by means of a carburettor
    • F02D35/0061—Controlling the emulsifying air only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/23—Fuel aerating devices
    • F02M7/24—Controlling flow of aerating air

Definitions

  • the present invention is directed to a system designed to correct the fuel-air ratio delivered by a carburetor for an internal combustion engine with the object of maintaining an optimum ratio under all working conditions of the engine.
  • the metering only takes places with respect to the fuel or the air and such metering is only associated with a single duct of the carburetor.
  • the system according to the present invention is capable of delivering a fuel-air mixture to the carburetor according to the criteria of maximum economy and maximum power.
  • the system according to the present invention eliminates the adverse influence of engine vibrations to the metering device for controlling the fuel-air ratio by supporting the metering device upon vehicle structure which is less subject to engine vibrations.
  • the system according to the present invention provides a simultaneous air metering function for one or more ducts of each stage of the carburetor so that the proper fuel-air ratio will be maintained under all operating conditions of the engine.
  • the system according to the present invention is comprised of an air filter, at least one carburetor, an internal combustion engine, an exhaust system for the gases produced by the combustion of the fuel-air mixture supplied by said carburetor, a sensor for detecting the composition of the exhaust gases, and electronic processor which processes the signal emitted by said sensor and a stepping motor responsive to the signal provided by said electronic processor for operating the metering device to control the air being supplied to the carburetor wherein said metering device is supported by a portion of the vehicle structure which is less exposed to the vibrations produced by the engine than the carburetor.
  • the metering device supplies air through a conduit to the upper portion of the emulsifier tube of the carburetor.
  • additional conduits are provided from the metering device for controlling the air delivered to the idling system as well as the main system of each carburetor.
  • FIG. 1 is a schematic view of the system according to the present invention.
  • FIG. 2 is a sectional view of a two-stage carburetor having a controlled air supply to each main duct in accordance with the present invention.
  • FIG. 3 is a sectional view of a two-stage carburetor having a controlled air supply to one of the idle ducts in accordance with the present invention.
  • FIG. 4 is a side elevational view of the air metering device according to the present invention.
  • FIG. 5 is a top plan view of the air metering device shown in FIG. 4.
  • FIG. 6 is a partial sectional view of the metering device taken along the line 6--6 of FIG. 5.
  • FIG. 7 is a sectional view of the driving lever taken along the line 7--7 in FIG. 8.
  • FIG. 8 is a plan view of a driving lever for imparting drive from the motor to the cam in the metering device.
  • FIG. 9 is an end view of the cam of the metering device according to the present invention.
  • FIG. 10 is a top plan view of the cam shown in FIG. 9.
  • FIG. 11 is a partial sectional view of the cam in FIG. 10 showing the stop pin.
  • FIG. 12 is a sectional view of the cam taken along the line 12--12 in FIG. 9.
  • FIG. 13 is a bottom plan view of the metering device with the motor removed.
  • FIG. 14 is a partial sectional view of the metering device taken along the line 14--14 in FIG. 13 with the location of the motor shown in dotted lines.
  • FIG. 15 is a partial sectional view of one of the metering valves of the metering device.
  • FIG. 16 is a sectional view of the cam follower plate taken along the line 16--16 in FIG. 17.
  • FIG. 17 is a plan view of the cam follower plate.
  • FIG. 18 is a side view of the cam follower plate of FIG. 17.
  • the system as shown in FIG. 1 is comprised of an internal combustion engine 20 having a carburetor 22 surmounted by an air filter 23 having an intake 24.
  • the exhaust gases are removed from the engine 20 through the conduit 25 and pass through a catalytic converter 26 before being discharged into the atmosphere.
  • the concentration of the combustion products should be maintained within certain limits corresponding to a stoichiometric metering of the fuel-air mixture supplied by the carburetor.
  • a metering device 27 is inserted into the air supply system for the carburetor. Fresh clean air is supplied from the air filter 23 to the metering device 27 through the conduit 28.
  • a probe 32 sensitive to the concentration of oxygen in the discharge gases is arranged in the discharged conduit 25 upstream of the converter 26.
  • the probe 32 is electrically connected to an electronic control unit 33 which is supplied with power by the standard battery 34' of the motor vehicle.
  • the electronic control unit 33 is connected to a stepping motor 35 which is operatively connected to the metering device 27.
  • the circuitry within the control unit 33 which supplies a control signal to the motor 35 in response to the signal received from the probe 32 is conventional and well known in the art and does not form a part of the present invention.
  • the control unit 33 sends a signal to the electric motor 35 for controlling the metering device 27 in such a manner as to bring the fuel-air ratio to the stoichiometric value.
  • the probe 32 is of the solid state electrolyte type and is also conventional in the art.
  • the motor driven metering device 27 is mounted on a portion of the vehicle body 37 as shown in FIG. 1 rather than on the engine as is the carburetor.
  • the additional air as metered by the metering device 27 is supplied to the carburetor through the conduits 39, 40 and 41.
  • the carburetor 22 as shown in FIG. 1 can be of the conventional two-stage type such as that shown in FIGS. 2 and 3.
  • the carburetor is provided with two intake passages 44 and 46 each having a throttle valve 45 and 47, respectively.
  • the main fuel supply system for the passage 44 is shown in FIG. 2 wherein the fuel is supplied from the float chamber 48 to the sump 49 by means of a jet 50.
  • the main air supply for the emulsifier passage 52 enters through the passage 54 and an auxiliary air supply under the control of a metering device 27 is supplied through the passage 56 to the top of the emulsifier passage 52.
  • the conduit 39 is connected to the fitting 56a which is secured at the entrance to the passage 56.
  • the fuel-air mixture is then supplied through the passage 57 to the venturi 58 of the passage 44.
  • the fuel supply for the other passage 46 is identical to that shown in FIG. 2 and the conduit 40 would be connected to a fitting similar to 56a in order to provide an auxiliary metered air supply in order to adjust the fuel-air ratio.
  • the supply of the fuel-air mixture during idle is shown in FIG. 3 wherein the fuel is supplied from the chamber 60 through the passage 61 to the idle jet 68.
  • the primary air supply to the idle jet 68 enters through the passage 69 and an auxiliary metered air supply is also provided to the idle jet through the passage 67 which is provided with a fitting 67a to which the conduit 41 would be connected.
  • the fuel-air mixture then passes through the duct 62 and nozzle 63 into the intake passage 44.
  • the metering device 27 controls the supply of air through the conduits 39, 40 and 41 to the main fuel supply passage of both barrels and to the idle fuel-air supply passage for one of the barrels or stages of the carburetor.
  • the metering device 27 and the various components thereof are shown in detail in FIGS. 4-18.
  • the metering device 27 is adapted to be mounted to the framework or body of the motor vehicle by means of bolts which may be secured in the threaded apertures 34 of the body of the metering device.
  • the cam 55 of the metering device 27 is mounted for rotation on a shaft 51 secured at one end in the body 52 of the metering device 27.
  • the cam is provided with an axially directed extension 57 adjacent the periphery of the cam which is engagable with the driving fork 56 secured to the shaft of the motor 25 for rotation therewith.
  • the cam 25' is also provided with a pin 58 which acts as a stop for the cam 55 by cooperating with a lug 59 extending from the body of the metering device as shown in FIG. 14.
  • the external surface 60' of the cam 55 has an overall spiral configuration as best seen in FIGS. 9 and 13 in order to provide a variable force on the resilient metal plate 80 which is interposed between the cam surface 60' and the ends 85 of the valve members 88.
  • the plate 80 has a general T-shaped configuration as shown in FIG. 17 with an elongated slot 81 through which a clamping screw 82 may extend.
  • a pair of projections 80a are provided on the wide end of the plate 80 for engagement with the surface 60' of the cam 55.
  • the plate 80 normally has a curvature as shown in the solid line configuration of FIG. 18 so that the plate will normally be biased against the cam surface. As the cam rotates, the plate 80 will be flexed to the dotted line position as shown in FIG. 18.
  • Each unit 83 is comprised of a substantially cylindrical body 84 having a threaded portion 94 so that the unit can be adjustably threaded into the body 52.
  • the outer end of the body 84 is provided with a hexagon portion 92 to facilitate the turning of the body.
  • An O ring 93 of suitable elastomeric material is provided to seal the unit 83 to the body 52 of the metering unit in an air-tight manner.
  • the body 84 is provided with a stepped bore 91 and one end is provided with a fitting 96 for the reception of the respective air conduit 39, 40 or 41.
  • a bushing 86 having an air passage therethrough is fitted in the opposite end of the body 84 and a valve member 88 is located in the chamber 99 within the body 84.
  • the valve member 88 is provided with a tapered conical portion 87 which extends into the apertured bushing 86 and a cylindrical end portion which is adapted to engage the cam operated plate 80.
  • a spring 90 is provided within the chamber 89 for normally biasing the conical portion 87 into seating engagement with the bushing 86 to prevent the flow of air through the apertured bushing 86, the chamber 89 and the passage 91.
  • the sensor 32 will provide a signal to the electronic control circuit 33.
  • the electronic control circuit will then provide a signal to the motor 35 proporational to the difference between a reference signal and the signal from the sensor 32.
  • the motor 35 under this signal will turn through an angle proportional thereto in a clockwise direction as viewed in FIG. 13 to gradually increase the effective radius of the cam. This will result in the displacement of a plate 80 to the right as viewed in FIGS. 13 and 14 to shift the valve members 87 upwardly as viewed in FIG. 15 to increase the area of the annular section of the passage within the bushing 86.
  • conduits Although three conduits have been shown for connection to the main ducts of each stage and the idling duct of one of the stages, the number of conduits would be varied depending upon the type of carburetor being used. When the carburetor is of the two-stage type with simultaneous throttle opening, there would be a fourth conduit connected to the idling duct of the other stage. Should the carburetor be of the single-stage type, there would only be two flexible conduits, the first being connected to the main duct of the carburetor and the second to the idling duct.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US05/875,710 1977-02-07 1978-02-06 System for the control of the composition of the fuel-air mixture of an internal combustion engine Expired - Lifetime US4181108A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3343A/77 1977-02-07
IT03343/77A IT1072173B (it) 1977-02-07 1977-02-07 Impianto atto a correggere il titolo della miscela erogata da carburatori per motori a combustione int

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254754A (en) * 1978-05-26 1981-03-10 Aisan Industry Co., Ltd. Air fuel ratio controller
US4276237A (en) * 1979-08-01 1981-06-30 Standard-Thomson Corporation Carburetor air control device
US4314536A (en) * 1979-12-31 1982-02-09 Acf Industries, Inc. Pulsing solenoid improvement
US4338265A (en) * 1979-08-08 1982-07-06 Aisan Industry Co., Ltd. Altitude compensation device
US4345560A (en) * 1979-01-16 1982-08-24 Nissan Motor Co., Ltd. Electronically controlled carburetor
US4347821A (en) * 1979-09-13 1982-09-07 Nissan Motor Company, Limited Air/fuel ratio control system for internal combustion engine having rotary valve and step motor
US4364359A (en) * 1980-08-14 1982-12-21 Honda Motor Co., Ltd. Control system for internal combustion engines, having function of detecting abnormalities in engine speed signal detecting system
US4367713A (en) * 1980-07-21 1983-01-11 Honda Giken Kogyo Kabushiki Kaisha Air/fuel ratio control system for internal combustion engines, having air/fuel control function at engine deceleration
US4432324A (en) * 1981-04-08 1984-02-21 Toyota Jidosha Kogyo Kabushiki Kaisha Air-fuel ratio control device of an internal combustion engine
US5072729A (en) * 1986-11-04 1991-12-17 Bird Products Corporation Ventilator exhalation valve
US5474062A (en) * 1987-11-04 1995-12-12 Bird Products Corporation Medical ventilator
US5494028A (en) * 1986-11-04 1996-02-27 Bird Products Corporation Medical ventilator
US5694926A (en) * 1994-10-14 1997-12-09 Bird Products Corporation Portable drag compressor powered mechanical ventilator
US5740781A (en) * 1996-05-09 1998-04-21 Tillotson, Ltd. Starting system for an internal combustion engine
US6135967A (en) * 1999-04-26 2000-10-24 Fiorenza; Anthony Joseph Respiratory ventilator with automatic flow calibration
US6240919B1 (en) 1999-06-07 2001-06-05 Macdonald John J. Method for providing respiratory airway support pressure
US6834637B1 (en) 2004-04-30 2004-12-28 Brunswick Corporation Adapter for an idle air control valve
CN110261572A (zh) * 2019-04-30 2019-09-20 江苏思威博生物科技有限公司 一种分子膜覆盖堆肥发酵智能检测装置及其使用方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909031A (en) * 1957-07-12 1959-10-20 Kiekhaefer Elmer Carl Vibration isolation of power head
US3906910A (en) * 1973-04-23 1975-09-23 Colt Ind Operating Corp Carburetor with feedback means and system
FR2315012A1 (fr) * 1975-06-20 1977-01-14 Berliet Automobiles Dispositif pour le montage souple du collecteur d'admission sur un moteur a combustion interne
US4072137A (en) * 1975-05-06 1978-02-07 Nippon Soken, Inc. Air-to-fuel ratio adjusting system for an internal combustion engine
US4084563A (en) * 1975-11-11 1978-04-18 Nippon Soken, Inc. Additional air control device for an internal combustion engine
US4085176A (en) * 1972-08-18 1978-04-18 Japan Non-Slip Pavement Co., Inc. Method of manufacturing non-slip pavement blocks
US4094273A (en) * 1975-07-14 1978-06-13 Nippon Soken, Inc. Air-fuel ratio adjusting system
US4103657A (en) * 1975-06-13 1978-08-01 Nissan Motor Company, Limited Twin-barrel carburetor with an air-fuel ratio control device
US4114372A (en) * 1975-06-13 1978-09-19 Nissan Motor Company, Limited Internal combustion engine with air-fuel ratio control device
US4114578A (en) * 1976-05-28 1978-09-19 Nippon Soken, Inc. Air-to-fuel ratio control system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909031A (en) * 1957-07-12 1959-10-20 Kiekhaefer Elmer Carl Vibration isolation of power head
US4085176A (en) * 1972-08-18 1978-04-18 Japan Non-Slip Pavement Co., Inc. Method of manufacturing non-slip pavement blocks
US3906910A (en) * 1973-04-23 1975-09-23 Colt Ind Operating Corp Carburetor with feedback means and system
US4072137A (en) * 1975-05-06 1978-02-07 Nippon Soken, Inc. Air-to-fuel ratio adjusting system for an internal combustion engine
US4103657A (en) * 1975-06-13 1978-08-01 Nissan Motor Company, Limited Twin-barrel carburetor with an air-fuel ratio control device
US4114372A (en) * 1975-06-13 1978-09-19 Nissan Motor Company, Limited Internal combustion engine with air-fuel ratio control device
FR2315012A1 (fr) * 1975-06-20 1977-01-14 Berliet Automobiles Dispositif pour le montage souple du collecteur d'admission sur un moteur a combustion interne
US4094273A (en) * 1975-07-14 1978-06-13 Nippon Soken, Inc. Air-fuel ratio adjusting system
US4084563A (en) * 1975-11-11 1978-04-18 Nippon Soken, Inc. Additional air control device for an internal combustion engine
US4114578A (en) * 1976-05-28 1978-09-19 Nippon Soken, Inc. Air-to-fuel ratio control system

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254754A (en) * 1978-05-26 1981-03-10 Aisan Industry Co., Ltd. Air fuel ratio controller
US4345560A (en) * 1979-01-16 1982-08-24 Nissan Motor Co., Ltd. Electronically controlled carburetor
US4276237A (en) * 1979-08-01 1981-06-30 Standard-Thomson Corporation Carburetor air control device
US4338265A (en) * 1979-08-08 1982-07-06 Aisan Industry Co., Ltd. Altitude compensation device
US4347821A (en) * 1979-09-13 1982-09-07 Nissan Motor Company, Limited Air/fuel ratio control system for internal combustion engine having rotary valve and step motor
US4314536A (en) * 1979-12-31 1982-02-09 Acf Industries, Inc. Pulsing solenoid improvement
US4367713A (en) * 1980-07-21 1983-01-11 Honda Giken Kogyo Kabushiki Kaisha Air/fuel ratio control system for internal combustion engines, having air/fuel control function at engine deceleration
US4364359A (en) * 1980-08-14 1982-12-21 Honda Motor Co., Ltd. Control system for internal combustion engines, having function of detecting abnormalities in engine speed signal detecting system
US4432324A (en) * 1981-04-08 1984-02-21 Toyota Jidosha Kogyo Kabushiki Kaisha Air-fuel ratio control device of an internal combustion engine
US5072729A (en) * 1986-11-04 1991-12-17 Bird Products Corporation Ventilator exhalation valve
US5494028A (en) * 1986-11-04 1996-02-27 Bird Products Corporation Medical ventilator
US5474062A (en) * 1987-11-04 1995-12-12 Bird Products Corporation Medical ventilator
US5694926A (en) * 1994-10-14 1997-12-09 Bird Products Corporation Portable drag compressor powered mechanical ventilator
US20050115564A1 (en) * 1994-10-14 2005-06-02 Devries Douglas F. Portable drag compressor powered mechanical ventilator
US5868133A (en) * 1994-10-14 1999-02-09 Bird Products Corporation Portable drag compressor powered mechanical ventilator
US5881722A (en) * 1994-10-14 1999-03-16 Bird Products Corporation Portable drag compressor powered mechanical ventilator
US7849854B2 (en) 1994-10-14 2010-12-14 Bird Products Corporation Portable drag compressor powered mechanical ventilator
US7222623B2 (en) 1994-10-14 2007-05-29 Birds Products Corporation Portable drag compressor powered mechanical ventilator
US6526970B2 (en) 1994-10-14 2003-03-04 Devries Douglas F. Portable drag compressor powered mechanical ventilator
US20030230307A1 (en) * 1994-10-14 2003-12-18 Devries Douglas F. Portable drag compressor powered mechanical ventilator
US20050150494A1 (en) * 1994-10-14 2005-07-14 Devries Douglas F. Portable drag compressor powered mechanical ventilator
US6877511B2 (en) 1994-10-14 2005-04-12 Bird Products Corporation Portable drag compressor powered mechanical ventilator
US5740781A (en) * 1996-05-09 1998-04-21 Tillotson, Ltd. Starting system for an internal combustion engine
US6135967A (en) * 1999-04-26 2000-10-24 Fiorenza; Anthony Joseph Respiratory ventilator with automatic flow calibration
US6240919B1 (en) 1999-06-07 2001-06-05 Macdonald John J. Method for providing respiratory airway support pressure
US6834637B1 (en) 2004-04-30 2004-12-28 Brunswick Corporation Adapter for an idle air control valve
CN110261572A (zh) * 2019-04-30 2019-09-20 江苏思威博生物科技有限公司 一种分子膜覆盖堆肥发酵智能检测装置及其使用方法

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